Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cba7b8612c8b0ea…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 04:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4a33cf1f4224a04625a391fe7a9421df SHA-1: 10e81643233691538ddc3589acded8b8abbca9ff SHA-256: 4cba7b8612c8b0eaec8e2620e241a376598deea519c40e3242028e02f67fc9bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=models+of+health+education+pdf PDF link annotation
    • http://pogotowienaukowe.com/Upload/file/7306110244.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ef2a9e393466fa3128e75f86b06b6abf/surutazinitujesodeni.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac607971741---11908918834.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c104f39ea---xegemifeniruberirabobot.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c18bb59fb03b8921a6e32040ace1af48/93550084461.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f20b45e261fed4691928177ea8b12ae8/somasabivedisexakofavi.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/60599717525.pdfIn PDF document text
    • http://hongdacable.com/d/files/68230875950.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/99ef3b5ffa98588acd356c6d26c801ae/34284253787.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/471692a8d31f5c17c2db1b3fb2dce62a/zefurejojaxipilunubibupo.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/79246956087.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/ritisa.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5275ed4bc33cbef1b2e5db448c2539be/67965308742.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/tibivikivimupusenadeluvug.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59c4b5a5c---fujewi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ab096344bfac863d298b3e9d7833ae8d/mesajaduwamevezex.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/gewate.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f39116f77f288445906f20589c1c42c7/xivopoxepawosokawuposana.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/vujanawuxuziwirunemularu.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/fedapazibixezuzig.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb028941e8---folukipuvagex.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r4jmpasd1kh7vtcbf59nhog60v/memigatep.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ubjtkds86ald89rk193ik2koih/lisetijagibejan.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/14678258530.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/ropevulosebevukegofogifef.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7cf4ef4d0---419724110.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 10708 bytes
SHA-256: 7031b8df69a137f9844a263f0059a4a880182a167aa8d295fbefa4c2499d9bb3
font_01_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 17216 bytes
SHA-256: 8bb793df82d2ec7aae759d3cbb55bbdb565b003c4cd399b0169659c17a3be57e
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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